Boiler.



L. D. FREEMAN.

BOILBR. APPLICATION FILED PERA?, 1913.

Patented Mar. 10, 19M

2 SHEETS-SHEET l.

L. D. FREEMAN.

BOILER.

APPLICATION FILED IBB. 11, 191s4 1,089,758, Patented Mar. 10, 1914.

2 SHEETS-SHEET 2.

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BOILER.

rescate.

Specification of Letters Patent.

Patented Mar. itt), i914.

Application filed February 17, 1913. Serial No. 748,930.

To ZZ 'whom yzf muy concern Be it known that I, Lewis D. llluiammx, a citizen of the United States, residing' at lftit'tsburg, in the county of Crawford and State of Kansas, have invented certain new and useful lmprovements in Boilers, of which the following is a specification.

This invention relates to boilers and the principal object of the invention resides in the production of a boiler which will produce increased evaporation of the water in accordance with the amount of fuel consumed in boilers of the ordinary type.

it is a well understood fact that in the ordinary types of locomotives or stationary boilers that approximately forty to fortyeight per cent. of the total evaporation of the water takes place around the sheets of the tire box, leaving approximately fifty two to sixty per cent. of the evaporation to take place in the `tlues of the boiler'. In most of the locomotive boilers of the present day the area of the fire box is only five per cent. of the total heating surface, therefore, making it evident that to increase this heating surface is an advantage which is highly dcsirable. This feature of increasing the heating surface of the fire box without appreeiably increasing the size thereof also has the advantage of permitting the boiler to be constructed with shorter tubes which removes considerable of the strain up-on the -flue sheets and prevents the loosening of the flue beading and its consequent leakage and also practically eliminates the expense of renewing these tubes at frequent intervals.

It is the object of this invention, therefore, to avoid the difficulties inherent in long tube boilers and to provide a boiler in which the heating surface of the tire box appreciably increased.

it further object of the invention is the provision of a boiler which has its fire box separated from the flues by what may be termed a water partition apertured so as to permit the passage of the flames and arranged to produce in effect a secondary combustion chamber, wherein complete combustion of the unconsumed products takes place.

Another object of the invention is to provide a boiler having an apertured water partition separating the fire box or primary combustion chamber from the tlues so that the total heating surface of the primary combustion chamber is increased and the direct action of the llames is removed from the boiler Ilues, thus eliminating destructive flue leakage caused from sudden expansion or contraction of the parts and at the same time producing a secondary combustion chamber' wherein the unconsumed products of combustion from the primary combustion chamber are comljilctcly consumed.

YFurther objects of the invention will appear as the following description is read in connection with the accompanying draw ings, which form a part of this invention, and in which Figure l is a longitudinal sectional view through an ordinary locomotive boiler, showing the improved type of lire box arrangement. Fig. 2 is a transverse section on the line Q-2 of Fig. l. Fig. 3 is a transverse section on the line 3-3 of Fig. l. Fig. t is a horizontal section on the line il-4 of Fig. l.

Referring more particularly to the drawing, 1 represents the boiler casing which is connected to the waist Q in the ordinary manner. The rear of the shell or casing` is indicated at 3 and is provided with the fuel opening at, as is usual. This fuel opening is coincident with a similar fuel opening formed in the furnace door sheet (3 which is sepa "ated, as is usual, from the front sheet 3 by the water space T, this separation bcing effected by the forward portion of the partition water space frame S. This water space completely surrounds the boiler` the sides being defined by the casing l and the combustion chamber sheets S).

The upper portion of the combustion chamber is covered by the usual crown sheet 10 which is connected to the sheets 9 and (3 and also at its rear edge to the rear partition sheet 1 1, '.lhis partition sheet and a similar partition sheet .l2 form a water space 1S which connnunicates with the water space l, the forward sheet 11 being connected at its sides with the sheets 9 and having a plurality of apertures ift formed therein which are coincident with similar apertures in the sheet 112 to form ports or passages l5 whose combined area exceeds the combined arca oil the lilies, as will he hereinafter described.

The partition plates 'lil and 1Q are held in separated relation at their lower ends by a cross piece 1G formed on the partition water space frame 8 and these plates, together with the water which is between them, form in effect a water partition and separate the combustion chamber 17 from the flues. The forward partition sheet is connected at its to to an auxiliary crown sheet 18 and to si e sheets 19 which, together with the rear flue sheet 20, forms an auxiliary or secondary combustion chamber 21. The flue sheet 20 has the usual fines 22 secured therein and extending forwardly to communicate with the smoke box where they are secured in the front iiue sheet 23. The waist of the boiler 2 is separated from the flue sheet by a connecting sheet 24 which is secured to one side of the forward end 25 of the frame S, the flue sheet being secured to the inner sides thereof, as shown in Fig. 1.y

Arranged between the parts 16 and 25 of the frame is a cinder hopper 26 having a removable plate 27 in the bottom thereof which constitutes a door by which access maybe had to the secondary combustion chamber 21, so that any repairs may be made to the fiues by simply banking the fires in the primary combustion chamber and without having to draw the fires. The crown sheets and side sheets 9 and 19 may be connected to the casing or shell in any suitable manner, such as by the usual crown screw or sling stays, while the partition sheets 11 and 12 are held in separated relation by screw stays 28. All joints are securely riveted together and the ports 15 are preferably formed by inwardly hanging the partition plates 12, as shown in Fig. 1.

Projecting upwardly into the combustion chamber 17 immediately adjacent the water partition and the side sheets 9 are a pair of, heater boxes 29 constructed of any suitable refractory material and having ports 30 extending up therethrough and arranged to project the air entering the lire box toward the rear thereof, as shown. These heater boxes admit a sufficient amount of air above the bed of lire in the fire box after completing the process of combustion and it will be well understood that these boxes, being surrounded by fuel under process of combustion, will become so hot that the air drawn through the same by the draft will be heat-f ed and in condition for thorough commingling` with the gases arising from the coals. This air entering directly in front of the water partition causes a complete combustion of the gases as they are passing through the ports in the partition, thus causing the partition to be practically surrounded by flame and the ports are made of a given diametertheir total area being in excess of the total area of the tubes so as to provide free passage of the flames into the secondary combustion chamber where they will be retarded by the restricted area of the tubes until complete combustion takes place.

lWhat is claimed is rThe combination with a boiler having flue sheets and iiues therein, of a primary combustion chamber, a secondary combustion chamber, a water partition dividing the secondary and primary combustion chambers and having a plurality of ports therein, the combined area of which is greater than the combined area of the fines, and air inlets leading into the primary combustion chamber adjacent the partition.

In testimony whereof I affix my signature in presence of two witnesses.

LEWIS D. FREEMAN.

lVitnesses W. O. HARTMAN, LOUIS FINN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

